Ultra-High Efficiency and Broad Band Operation of Infrared Metasurface Anomalous Reflector based on Graphene Plasmonics

Infrared metasurface anomalous reflector with ultra-high efficiency and broad band operation is designed via multi-sheet graphene layer with triangular holes. The anomalous reflection angle covers the range of 10° to 90° with the efficiency higher than 80%, over a broad spectral range from 7 μm–40 μ...

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Bibliographic Details
Published in:Scientific reports 2019-02, Vol.9 (1), p.1249-1249, Article 1249
Main Authors: Soleymani, Sina, Güngördü, M. Zeki, Kung, Patrick, Kim, Seongsin M.
Format: Article
Language:English
Subjects:
639/624/399/1015
639/624/399/918/1054
Efficiency
Electrochemistry
Gating
Graphene
Humanities and Social Sciences
multidisciplinary
Periodicity
Science
Science (multidisciplinary)
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Summary:Infrared metasurface anomalous reflector with ultra-high efficiency and broad band operation is designed via multi-sheet graphene layer with triangular holes. The anomalous reflection angle covers the range of 10° to 90° with the efficiency higher than 80%, over a broad spectral range from 7 μm–40 μm of infrared spectrum. It reaches above 92% at the center wavelength in the spectral response. By increasing the periodicity of phase gradient, we can expand this frequency band even further without losing efficiency. The compact design of metasurface affords the adjustability of the electrochemical potential level of graphene by means of gating. Additionally, the impact of the number of graphene sheets for the optimum efficiency of the proposed structure is investigated. By adding the secondary graphene metasurface with opposite direction of phase gradient, we demonstrated the tunability of the reflection angle from θ r to − θ r with bias voltage.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-018-37562-y